Improvement on mill-picks



ALBERT RASNER. Improvement in Mill Picks. No. 120,536. Patentedoct.31,1871.

Jamar/*0 ufmjsl I PATENT OFFICE.

ALBERT RASNER, OF DAYTON, OHIO.

IMPROVEMENT ON MILL-PICKS.

Specification forming part of Letters Patent No. 120,536, dated October31, 1871.

To all whom it may concern:

Be it known that I, ALBERT RASNER, of Dayton, in the county ofMontgomery and in the State of Ohio, have invented certain new anduseful Improvements in Mill-Picks; and do hereby declare that thefollowing is a full, clear, and exact description thereof, referencebeing had to the accompanying drawing making a part of thisspecification, in which- Figure 1 is a plan view of the upper side of mydevice. Fig. 2 is a longitudinal central section of the same on the line00 w of Fig. 1. Figs. 3 and 4 are plan views, respectively, of the innersides of the cap and head for containing the picks. Fig. 5 is a frontelevation of said head with the picks removed. Fig. 6 is a cross-sectionof the same on the line as w of Fig. 1. Figs. 7 and 9 are plan views ofthe upper sides of two modifications of my device, and Figs. 8 and 10are central longitudinal sections of the same on the lines t and z",respectively, of Figs. 7 and 9.

Letters of like name and kind refer to like parts in each of thefigures.

The object of my invention is the production of a hand-tool for dressingmill-stones in which the cutters or picks shall be separate and easilydetachable for the purpose of repairs or of renewal and it consists inthe peculiar construction of the head, within which, by means of awedge, the picks or cutters are held, substantially as and for thepurpose hereinafter specified.

In the annexed drawing, Arepresents the head, having a generalrectangular form in plan view, the lower side of which is provided witha shank, B, for insertion within a handle, 0, while from its upper sideextends outward a stud or pin, D,

having preferably an elliptical form transversely. The upper face ofsaid head has a slight downward curve from its center toward either end,and is provided immediately outside of the stud D with two shoulders, a,which extend vertically upward and in a line horizontally at a rightangle to that of the sides of said head. Fitted over or upon the head Aand pin D is a cap, E, which corresponds in general size and shape tosaid head, and is provided upon each side with a flange, e, whichextends downward and incloses the sides of the same. The cap thus formedis secured to or upon the head by means of a wedge,

F, which passes transversely across the upper side of the same andthrough a suitable slot in the pin D, and, when driven inward, pressessaid cap downward toward the upper face of said head so as to clampbetween the same and the lower face of said cap the picks G, which pickscorrespond in transverse size with the space between the flanges e, andare each provided with a square end, which bears against the shouldersat and sustains the shock of the blows received upon or by said picks.When it is desired to remove a pick the wedge is driven out of its slotand the cap released and raised so as to increase vertically the size ofthe opening between the same and the head.

In Figs. 7 and 8 are shown a modification of the device just described,in which modification the.

cap is dispensed with, or, rather, is made to form a part of said head,while the pick is constructed of one piece and provided upon or withinits lower side, at its longitudinal center, with a transversedepression, which fits over a corresponding elevation upon said head andserves to insure the relative positions of said parts when the former ispressed downward against the latter by means of the wedge F. A furthermodifi cation is illustrated in Figs. 9 and 10, in which the head A isprovided with side flanges A, which extend upward sufficiently toinclose the picks G and cap E, and at their longitudinal centers areextendedstill further upward, so as to contain slots for the receptionofthe wedge F. The cap E, constructed from a piece of metal, correspondsin general form and size transversely with the picks, and has asufficient curve to cause it to conform to and fit upon the upper sidesof the same. In order that the picks may be firmly held in longitudinalposition, and at the same time be held when worn to less than theiroriginal length, their inner ends are bent downward at an angle of aboutthirty degrees, and each fits into a corresponding notch, a, out withinthe face of the head. By providing a series of said notches between theouter ends and center'of the head the picks can be caused to project toa greater or less distance from the same.

The especial advantages obtained by this construction of a mill-pick arethat it enables the operator to readily remove and dress his cutters,and also to make use of several sets of the same at a comparativelysmall cost, so as to render it wedge F, in combination with each other,subnecessary to have them dressed but seldom, instantially as and forthe purpose specified.

stead, as has heretofore been necessary, of hav- In testimony that Iclaim the foregoing I have in g each pick-head and its cutters formed ofone hereunto set my hand this 27th day of July, 1871.

piece, at a large expense and great inconvenience. V ALBERT RASNER.

Having thus fully set forth the nature and merits of my lnvention, whatI claim as new 1s Witnesses: A

The head A provided with the shoulders at and GEO. S. PRIN'DLE, slottedstud D, the perforated cap 'E, and the WM. AL'lICK. (153)

